condition mean min max ZT0-3 2.267703492 2.228491831 2.3069151530000003 ZT4-7 3.99552002525 3.4389204685 4.5521195819999996 ZT8-11 11.91985375075 7.6290316065 16.210675895 ZT12-15 16.51690990325 14.120503916499999 18.91331589 ZT16-19 11.78553802 10.07883788 13.49223816 ZT20-23 7.68915592575 7.0773527125 8.300959139